/*
* Copyright (C) 2000 Helix Code Inc.
*
* Authors: Michael Zucchi <notzed@helixcode.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public License
* as published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/* What should hopefully be a fast mail parser */
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <stdio.h>
#include <errno.h>
#include <unicode.h>
#include <glib.h>
#include "camel-mime-parser.h"
#include "camel-mime-utils.h"
#include "camel-mime-filter.h"
#include "camel-stream.h"
#include "camel-seekable-stream.h"
#define r(x)
#define h(x)
#define c(x)
#define d(x)
#define SCAN_BUF 4096 /* size of read buffer */
#define SCAN_HEAD 128 /* headroom guaranteed to be before each read buffer */
/* a little hacky, but i couldn't be bothered renaming everything */
#define _header_scan_state _CamelMimeParserPrivate
#define _PRIVATE(o) (((CamelMimeParser *)(o))->priv)
struct _header_scan_state {
/* global state */
enum _header_state state;
/* for building headers during scanning */
char *outbuf;
char *outptr;
char *outend;
int fd; /* input for a fd input */
CamelStream *stream; /* or for a stream */
/* for scanning input buffers */
char *realbuf; /* the real buffer, SCAN_HEAD*2 + SCAN_BUF bytes */
char *inbuf; /* points to a subset of the allocated memory, the underflow */
char *inptr; /* (upto SCAN_HEAD) is for use by filters so they dont copy all data */
char *inend;
int atleast;
int seek; /* current offset to start of buffer */
int unstep; /* how many states to 'unstep' (repeat the current state) */
int midline; /* are we mid-line interrupted? */
int scan_from; /* do we care about From lines? */
int start_of_from; /* where from started */
int start_of_headers; /* where headers started from the last scan */
int header_start; /* start of last header, or -1 */
struct _header_scan_stack *top_part; /* top of message header */
int top_start; /* offset of start */
struct _header_scan_stack *pending; /* if we're pending part info, from the wrong part end */
/* filters to apply to all content before output */
int filterid; /* id of next filter */
struct _header_scan_filter *filters;
/* per message/part info */
struct _header_scan_stack *parts;
};
struct _header_scan_stack {
struct _header_scan_stack *parent;
enum _header_state savestate; /* state at invocation of this part */
struct _header_raw *headers; /* headers for this part */
struct _header_content_type *content_type;
char *boundary; /* for multipart/ * boundaries, including leading -- and trailing -- for the final part */
int boundarylen; /* length of boundary, including leading -- */
};
struct _header_scan_filter {
struct _header_scan_filter *next;
int id;
CamelMimeFilter *filter;
};
static void folder_scan_step(struct _header_scan_state *s, char **databuffer, int *datalength);
static void folder_scan_drop_step(struct _header_scan_state *s);
static int folder_scan_init_with_fd(struct _header_scan_state *s, int fd);
static int folder_scan_init_with_stream(struct _header_scan_state *s, CamelStream *stream);
static struct _header_scan_state *folder_scan_init(void);
static void folder_scan_close(struct _header_scan_state *s);
static struct _header_scan_stack *folder_scan_content(struct _header_scan_state *s, int *lastone, char **data, int *length);
static struct _header_scan_stack *folder_scan_header(struct _header_scan_state *s, int *lastone);
static int folder_scan_skip_line(struct _header_scan_state *s);
static off_t folder_seek(struct _header_scan_state *s, off_t offset, int whence);
static off_t folder_tell(struct _header_scan_state *s);
static void camel_mime_parser_class_init (CamelMimeParserClass *klass);
static void camel_mime_parser_init (CamelMimeParser *obj);
static char *states[] = {
"HSCAN_INITIAL",
"HSCAN_FROM", /* got 'From' line */
"HSCAN_HEADER", /* toplevel header */
"HSCAN_BODY", /* scanning body of message */
"HSCAN_MULTIPART", /* got multipart header */
"HSCAN_MESSAGE", /* rfc822 message */
"HSCAN_PART", /* part of a multipart */
"<invalid>",
"HSCAN_EOF", /* end of file */
"HSCAN_FROM_END",
"HSCAN_HEAER_END",
"HSCAN_BODY_END",
"HSCAN_MULTIPART_END",
"HSCAN_MESSAGE_END",
};
static GtkObjectClass *camel_mime_parser_parent;
enum SIGNALS {
LAST_SIGNAL
};
static guint signals[LAST_SIGNAL] = { 0 };
guint
camel_mime_parser_get_type (void)
{
static guint type = 0;
if (!type) {
GtkTypeInfo type_info = {
"CamelMimeParser",
sizeof (CamelMimeParser),
sizeof (CamelMimeParserClass),
(GtkClassInitFunc) camel_mime_parser_class_init,
(GtkObjectInitFunc) camel_mime_parser_init,
(GtkArgSetFunc) NULL,
(GtkArgGetFunc) NULL
};
type = gtk_type_unique (gtk_object_get_type (), &type_info);
}
return type;
}
static void
finalise(GtkObject *o)
{
struct _header_scan_state *s = _PRIVATE(o);
folder_scan_close(s);
((GtkObjectClass *)camel_mime_parser_parent)->finalize (o);
}
static void
camel_mime_parser_class_init (CamelMimeParserClass *klass)
{
GtkObjectClass *object_class = (GtkObjectClass *) klass;
camel_mime_parser_parent = gtk_type_class (gtk_object_get_type ());
object_class->finalize = finalise;
gtk_object_class_add_signals (object_class, signals, LAST_SIGNAL);
}
static void
camel_mime_parser_init (CamelMimeParser *obj)
{
struct _header_scan_state *s;
s = folder_scan_init();
_PRIVATE(obj) = s;
}
/**
* camel_mime_parser_new:
*
* Create a new CamelMimeParser object.
*
* Return value: A new CamelMimeParser widget.
**/
CamelMimeParser *
camel_mime_parser_new (void)
{
CamelMimeParser *new = CAMEL_MIME_PARSER ( gtk_type_new (camel_mime_parser_get_type ()));
return new;
}
/**
* camel_mime_parser_filter_add:
* @m:
* @mf:
*
* Add a filter that will be applied to any body content before it is passed
* to the caller. Filters may be pipelined to perform multi-pass operations
* on the content, and are applied in the order they were added.
*
* Note that filters are only applied to the body content of messages, and once
* a filter has been set, all content returned by a filter_step() with a state
* of HSCAN_BODY will have passed through the filter.
*
* Return value: An id that may be passed to filter_remove() to remove
* the filter, or -1 if the operation failed.
**/
int
camel_mime_parser_filter_add(CamelMimeParser *m, CamelMimeFilter *mf)
{
struct _header_scan_state *s = _PRIVATE(m);
struct _header_scan_filter *f, *new;
new = g_malloc(sizeof(*new));
new->filter = mf;
new->id = s->filterid++;
if (s->filterid == -1)
s->filterid++;
new->next = 0;
gtk_object_ref((GtkObject *)mf);
/* yes, this is correct, since 'next' is the first element of the struct */
f = (struct _header_scan_filter *)&s->filters;
while (f->next)
f = f->next;
f->next = new;
return new->id;
}
/**
* camel_mime_parser_filter_remove:
* @m:
* @id:
*
* Remove a processing filter from the pipeline. There is no
* restriction on the order the filters can be removed.
**/
void
camel_mime_parser_filter_remove(CamelMimeParser *m, int id)
{
struct _header_scan_state *s = _PRIVATE(m);
struct _header_scan_filter *f, *old;
f = (struct _header_scan_filter *)&s->filters;
while (f && f->next) {
old = f->next;
if (old->id == id) {
gtk_object_unref((GtkObject *)old->filter);
f->next = old->next;
g_free(old);
/* there should only be a single matching id, but
scan the whole lot anyway */
}
f = f->next;
}
}
/**
* camel_mime_parser_header:
* @m:
* @name: Name of header.
* @offset: Pointer that can receive the offset of the header in
* the stream from the start of parsing.
*
* Lookup a header by name.
*
* Return value: The header value, or NULL if the header is not
* defined.
**/
const char *
camel_mime_parser_header(CamelMimeParser *m, const char *name, int *offset)
{
struct _header_scan_state *s = _PRIVATE(m);
if (s->parts &&
s->parts->headers) {
return header_raw_find(&s->parts->headers, name, offset);
}
return NULL;
}
/**
* camel_mime_parser_headers_raw:
* @m:
*
* Get the list of the raw headers which are defined for the
* current state of the parser. These headers are valid
* until the next call to parser_step(), or parser_drop_step().
*
* Return value: The raw headers, or NULL if there are no headers
* defined for the current part or state.
**/
struct _header_raw *
camel_mime_parser_headers_raw(CamelMimeParser *m)
{
struct _header_scan_state *s = _PRIVATE(m);
if (s->parts)
return s->parts->headers;
return NULL;
}
/**
* camel_mime_parser_init_with_fd:
* @m:
* @fd: A valid file descriptor.
*
* Initialise the scanner with an fd. The scanner's offsets
* will be relative to the current file position of the file
* descriptor. As a result, seekable descritors should
* be seeked using the parser seek functions.
*
* An initial buffer will be read from the file descriptor
* immediately, although no parsing will occur.
*
* Return value: Returns -1 on error.
**/
int
camel_mime_parser_init_with_fd(CamelMimeParser *m, int fd)
{
struct _header_scan_state *s = _PRIVATE(m);
return folder_scan_init_with_fd(s, fd);
}
/**
* camel_mime_parser_init_with_stream:
* @m:
* @stream:
*
* Initialise the scanner with a source stream. The scanner's
* offsets will be relative to the current file position of
* the stream. As a result, seekable streams should only
* be seeked using the parser seek function.
*
* An initial buffer will be read from the stream
* immediately, although no parsing will occur.
*
* Return value: -1 on error.
**/
int
camel_mime_parser_init_with_stream(CamelMimeParser *m, CamelStream *stream)
{
struct _header_scan_state *s = _PRIVATE(m);
return folder_scan_init_with_stream(s, stream);
}
/**
* camel_mime_parser_scan_from:
* @m:
* @scan_from: #TRUE if the scanner should scan From lines.
*
* Tell the scanner if it should scan "^From " lines or not.
*
* If the scanner is scanning from lines, two additional
* states HSCAN_FROM and HSCAN_FROM_END will be returned
* to the caller during parsing.
**/
void
camel_mime_parser_scan_from(CamelMimeParser *m, int scan_from)
{
struct _header_scan_state *s = _PRIVATE(m);
s->scan_from = scan_from;
}
/**
* camel_mime_parser_content_type:
* @m:
*
* Get the content type defined in the current part.
*
* Return value: A content_type structure, or NULL if there
* is no content-type defined for this part of state of the
* parser.
**/
struct _header_content_type *
camel_mime_parser_content_type(CamelMimeParser *m)
{
struct _header_scan_state *s = _PRIVATE(m);
/* FIXME: should this search up until its found the 'right'
content-type? can it? */
if (s->parts)
return s->parts->content_type;
return NULL;
}
/**
* camel_mime_parser_unstep:
* @m:
*
* Cause the last step operation to repeat itself. If this is
* called repeated times, then the same step will be repeated
* that many times.
*
* Note that it is not possible to scan back using this function,
* only to have a way of peeking the next state.
**/
void camel_mime_parser_unstep(CamelMimeParser *m)
{
struct _header_scan_state *s = _PRIVATE(m);
s->unstep++;
}
/**
* camel_mime_parser_drop_step:
* @m:
*
* Drop the last step call. This should only be used
* in conjunction with seeking of the stream as the
* stream may be in an undefined state relative to the
* state of the parser.
*
* Use this call with care.
**/
void camel_mime_parser_drop_step(CamelMimeParser *m)
{
struct _header_scan_state *s = _PRIVATE(m);
s->unstep = 0;
folder_scan_drop_step(s);
}
/**
* camel_mime_parser_step:
* @m:
* @databuffer: Pointer to accept a pointer to the data
* associated with this step (if any).
* @datalength: Pointer to accept a pointer to the data
* length associated with this step (if any).
*
* Parse the next part of the MIME message. If _unstep()
* has been called, then continue to return the same state
* for that many calls.
*
* If the step is HSCAN_BODY then the databuffer and datalength
* pointers will be setup to point to the internal data buffer
* of the scanner and may be processed as required. Any
* filters will have already been applied to this data.
*
* Refer to the state diagram elsewhere for a full listing of
* the states an application is gauranteed to get from the
* scanner.
*
* Return value: The current new state of the parser
* is returned.
**/
enum _header_state
camel_mime_parser_step(CamelMimeParser *m, char **databuffer, int *datalength)
{
struct _header_scan_state *s = _PRIVATE(m);
d(printf("OLD STATE: '%s' :\n", states[s->state]));
if (s->unstep <= 0)
folder_scan_step(s, databuffer, datalength);
else
s->unstep--;
d(printf("NEW STATE: '%s' :\n", states[s->state]));
return s->state;
}
/**
* camel_mime_parser_tell:
* @m:
*
* Return the current scanning offset. The meaning of this
* value will depend on the current state of the parser.
*
* An incomplete listing of the states:
*
* HSCAN_INITIAL, The start of the current message.
* HSCAN_HEADER, HSCAN_MESSAGE, HSCAN_MULTIPART, the character
* position immediately after the end of the header.
* HSCAN_BODY, Position within the message of the start
* of the current data block.
* HSCAN_*_END, The position of the character starting
* the next section of the scan (the last position + 1 of
* the respective current state).
*
* Return value: See above.
**/
off_t camel_mime_parser_tell(CamelMimeParser *m)
{
struct _header_scan_state *s = _PRIVATE(m);
return folder_tell(s);
}
/**
* camel_mime_parser_tell_start_headers:
* @m:
*
* Find out the position within the file of where the
* headers started, this is cached by the parser
* at the time.
*
* Return value: The header start position, or -1 if
* no headers were scanned in the current state.
**/
off_t camel_mime_parser_tell_start_headers(CamelMimeParser *m)
{
struct _header_scan_state *s = _PRIVATE(m);
return s->start_of_headers;
}
/**
* camel_mime_parser_tell_start_from:
* @m:
*
* If the parser is scanning From lines, then this returns
* the position of the start of the From line.
*
* Return value: The start of the from line, or -1 if there
* was no From line, or From lines are not being scanned.
**/
off_t camel_mime_parser_tell_start_from(CamelMimeParser *m)
{
struct _header_scan_state *s = _PRIVATE(m);
return s->start_of_from;
}
/**
* camel_mime_parser_seek:
* @m:
* @off: Number of bytes to offset the seek by.
* @whence: SEEK_SET, SEEK_CUR, SEEK_END
*
* Reset the source position to a known value.
*
* Note that if the source stream/descriptor was not
* positioned at 0 to begin with, and an absolute seek
* is specified (whence != SEEK_CUR), then the seek
* position may not match the desired seek position.
*
* Return value: The new seek offset, or -1 on
* an error (for example, trying to seek on a non-seekable
* stream or file descriptor).
**/
off_t camel_mime_parser_seek(CamelMimeParser *m, off_t off, int whence)
{
struct _header_scan_state *s = _PRIVATE(m);
return folder_seek(s, off, whence);
}
/**
* camel_mime_parser_state:
* @m:
*
* Get the current parser state.
*
* Return value: The current parser state.
**/
enum _header_state camel_mime_parser_state(CamelMimeParser *m)
{
struct _header_scan_state *s = _PRIVATE(m);
return s->state;
}
/**
* camel_mime_parser_stream:
* @m:
*
* Get the stream, if any, the parser has been initialised
* with. May be used to setup sub-streams, but should not
* be read from directly (without saving and restoring
* the seek position in between).
*
* Return value: The stream from _init_with_stream(), or NULL
* if the parser is reading from a file descriptor or is
* uninitialised.
**/
CamelStream *camel_mime_parser_stream(CamelMimeParser *m)
{
struct _header_scan_state *s = _PRIVATE(m);
return s->stream;
}
/**
* camel_mime_parser_fd:
* @m:
*
* Return the file descriptor, if any, the parser has been
* initialised with.
*
* Should not be read from unless the parser it to terminate,
* or the seek offset can be reset before the next parse
* step.
*
* Return value: The file descriptor or -1 if the parser
* is reading from a stream or has not been initialised.
**/
int camel_mime_parser_fd(CamelMimeParser *m)
{
struct _header_scan_state *s = _PRIVATE(m);
return s->fd;
}
/* ********************************************************************** */
/* Implementation */
/* ********************************************************************** */
/* read the next bit of data, ensure there is enough room 'atleast' bytes */
static int
folder_read(struct _header_scan_state *s)
{
int len;
int inoffset;
if (s->inptr<s->inend-s->atleast)
return s->inend-s->inptr;
/* check for any remaning bytes (under the atleast limit( */
inoffset = s->inend - s->inptr;
if (inoffset>0) {
memcpy(s->inbuf, s->inptr, inoffset);
}
if (s->stream) {
len = camel_stream_read(s->stream, s->inbuf+inoffset, SCAN_BUF-inoffset);
} else {
len = read(s->fd, s->inbuf+inoffset, SCAN_BUF-inoffset);
}
r(printf("read %d bytes, offset = %d\n", len, inoffset));
if (len>=0) {
/* add on the last read block */
s->seek += s->inptr - s->inbuf;
s->inptr = s->inbuf;
s->inend = s->inbuf+len+inoffset;
r(printf("content = %d '%.*s'\n",s->inend - s->inptr, s->inend - s->inptr, s->inptr));
}
r(printf("content = %d '%.*s'\n", s->inend - s->inptr, s->inend - s->inptr, s->inptr));
return s->inend-s->inptr;
}
/* return the current absolute position of the data pointer */
static off_t
folder_tell(struct _header_scan_state *s)
{
return s->seek + (s->inptr - s->inbuf);
}
/*
need some way to prime the parser state, so this actually works for
other than top-level messages
*/
static off_t
folder_seek(struct _header_scan_state *s, off_t offset, int whence)
{
off_t newoffset;
int len;
if (s->stream) {
if (CAMEL_IS_SEEKABLE_STREAM(s->stream)) {
/* NOTE: assumes whence seekable stream == whence libc, which is probably
the case (or bloody well should've been) */
newoffset = camel_seekable_stream_seek((CamelSeekableStream *)s->stream, offset, whence);
} else {
newoffset = -1;
errno = EINVAL;
}
} else {
newoffset = lseek(s->fd, offset, whence);
}
if (newoffset != -1) {
s->seek = newoffset;
s->inptr = s->inbuf;
s->inend = s->inbuf;
if (s->stream)
len = camel_stream_read(s->stream, s->inbuf, SCAN_BUF);
else
len = read(s->fd, s->inbuf, SCAN_BUF);
if (len>=0)
s->inend = s->inbuf+len;
else
newoffset = -1;
}
return newoffset;
}
static void
folder_push_part(struct _header_scan_state *s, struct _header_scan_stack *h)
{
h->parent = s->parts;
s->parts = h;
}
static void
folder_pull_part(struct _header_scan_state *s)
{
struct _header_scan_stack *h;
h = s->parts;
if (h) {
s->parts = h->parent;
g_free(h->boundary);
header_raw_clear(&h->headers);
header_content_type_unref(h->content_type);
g_free(h);
} else {
g_warning("Header stack underflow!\n");
}
}
static int
folder_scan_skip_line(struct _header_scan_state *s)
{
int atleast = s->atleast;
register char *inptr, *inend, c;
int len;
s->atleast = 1;
while ( (len = folder_read(s)) > 0 && len > s->atleast) { /* ensure we have at least enough room here */
inptr = s->inptr;
inend = s->inend-1;
c = -1;
while (inptr<inend
&& (c = *inptr++)!='\n')
;
s->inptr = inptr;
if (c=='\n') {
s->atleast = atleast;
return 0;
}
}
s->atleast = atleast;
return -1; /* not found */
}
/* TODO: Is there any way to make this run faster? It gets called a lot ... */
static struct _header_scan_stack *
folder_boundary_check(struct _header_scan_state *s, const char *boundary, int *lastone)
{
struct _header_scan_stack *part;
int len = s->atleast-2; /* make sure we dont access past the buffer */
h(printf("checking boundary marker upto %d bytes\n", len));
part = s->parts;
while (part) {
h(printf(" boundary: %s\n", part->boundary));
h(printf(" against: '%.*s'\n", len, boundary));
if (part->boundary
&& part->boundarylen <= len
&& memcmp(boundary, part->boundary, part->boundarylen)==0) {
h(printf("matched boundary: %s\n", part->boundary));
/* again, make sure we're in range */
if (part->boundarylen <= len+2) {
h(printf("checking lastone\n"));
*lastone = (boundary[part->boundarylen]=='-'
&& boundary[part->boundarylen+1]=='-');
} else {
h(printf("not enough room to check last one?\n"));
*lastone = FALSE;
}
/*printf("ok, we found it! : %s \n", (*lastone)?"Last one":"More to come?");*/
return part;
}
part = part->parent;
}
return NULL;
}
/* Copy the string start->inptr into the header buffer (s->outbuf),
grow if necessary
and track the start offset of the header */
/* Basically an optimised version of g_byte_array_append() */
#define header_append(s, start, inptr) \
{ \
register int headerlen = inptr-start; \
\
if (headerlen >= (s->outend - s->outptr)) { \
register char *outnew; \
register int len = ((s->outend - s->outbuf)+headerlen)*2+1; \
outnew = g_realloc(s->outbuf, len); \
s->outptr = s->outptr - s->outbuf + outnew; \
s->outbuf = outnew; \
s->outend = outnew + len; \
} \
memcpy(s->outptr, start, headerlen); \
s->outptr += headerlen; \
if (s->header_start == -1) \
s->header_start = (start-s->inbuf) + s->seek; \
}
static struct _header_scan_stack *
folder_scan_header(struct _header_scan_state *s, int *lastone)
{
int atleast = s->atleast;
register char *inptr, *inend;
char *start;
int len;
struct _header_scan_stack *part, *overpart = s->parts;
struct _header_scan_stack *h;
h(printf("scanning first bit\n"));
h = g_malloc0(sizeof(*h));
/* FIXME: this info should be cached ? */
part = s->parts;
s->atleast = 5;
while (part) {
if (part->boundary)
s->atleast = MAX(s->atleast, part->boundarylen+2);
part = part->parent;
}
#if 0
s->atleast = MAX(s->atleast, 5);
if (s->parts)
s->atleast = MAX(s->atleast, s->parts->boundarylen+2);
#endif
*lastone = FALSE;
retry:
while ((len = folder_read(s))>0 && len >= s->atleast) { /* ensure we have at least enough room here */
inptr = s->inptr;
inend = s->inend-s->atleast;
start = inptr;
while (inptr<=inend) {
register int c=-1;
/*printf(" '%.20s'\n", inptr);*/
if (!s->midline
&& (part = folder_boundary_check(s, inptr, lastone))) {
if ((s->outptr>s->outbuf) || (inptr-start))
goto header_truncated; /* may not actually be truncated */
goto normal_exit;
}
/* goto next line */
while (inptr<=inend && (c = *inptr++)!='\n')
;
header_append(s, start, inptr);
h(printf("outbuf[0] = %02x '%c' oubuf[1] = %02x '%c'\n",
s->outbuf[0], isprint(s->outbuf[0])?s->outbuf[0]:'.',
s->outbuf[1], isprint(s->outbuf[1])?s->outbuf[1]:'.'));
if (c!='\n') {
s->midline = TRUE;
} else {
if (!(inptr[0] == ' ' || inptr[0] == '\t')) {
if (s->outbuf[0] == '\n'
|| (s->outbuf[0] == '\r' && s->outbuf[1]=='\n')) {
goto header_done;
}
/* we always have at least _1_ char here ... */
if (s->outptr[-1] == '\n')
s->outptr--;
s->outptr[0] = 0;
d(printf("header %.10s at %d\n", s->outbuf, s->header_start));
header_raw_append_parse(&h->headers, s->outbuf, s->header_start);
if (inptr[0]=='\n'
|| (inptr[0] == '\r' && inptr[1]=='\n')) {
inptr++;
goto header_done;
}
s->outptr = s->outbuf;
s->header_start = -1;
}
s->midline = FALSE;
start = inptr;
}
}
s->inptr = inptr;
}
/* ok, we're at the end of the data, just make sure we're not missing out some small
truncated header markers */
if (overpart) {
overpart = overpart->parent;
while (overpart) {
if (overpart->boundary && (overpart->boundarylen+2) < s->atleast) {
s->atleast = overpart->boundarylen+2;
h(printf("Retrying next smaller part ...\n"));
goto retry;
}
overpart = overpart->parent;
}
}
if ((s->outptr > s->outbuf) || s->inend > s->inptr) {
start = s->inptr;
inptr = s->inend;
goto header_truncated;
}
s->atleast = atleast;
return h;
header_truncated:
header_append(s, start, inptr);
if (s->outptr>s->outbuf && s->outptr[-1] == '\n')
s->outptr--;
s->outptr[0] = 0;
if (s->outbuf[0] == '\n'
|| (s->outbuf[0] == '\r' && s->outbuf[1]=='\n')) {
goto header_done;
}
header_raw_append_parse(&h->headers, s->outbuf, s->header_start);
header_done:
part = s->parts;
s->outptr = s->outbuf;
normal_exit:
s->inptr = inptr;
s->atleast = atleast;
s->header_start = -1;
return h;
}
static struct _header_scan_stack *
folder_scan_content(struct _header_scan_state *s, int *lastone, char **data, int *length)
{
int atleast = s->atleast;
register char *inptr, *inend;
char *start;
int len;
struct _header_scan_stack *part, *overpart = s->parts;
int already_packed = FALSE;
/*printf("scanning content\n");*/
/* FIXME: this info should be cached ? */
part = s->parts;
s->atleast = 5;
while (part) {
if (part->boundary) {
c(printf("boundary: %s\n", part->boundary));
s->atleast = MAX(s->atleast, part->boundarylen+2);
}
part = part->parent;
}
/* s->atleast = MAX(s->atleast, 5);*/
#if 0
if (s->parts)
s->atleast = MAX(s->atleast, s->parts->boundarylen+2);
#endif
*lastone = FALSE;
retry:
c(printf("atleast = %d\n", s->atleast));
while ((len = folder_read(s))>0 && len >= s->atleast) { /* ensure we have at least enough room here */
inptr = s->inptr;
inend = s->inend-s->atleast;
start = inptr;
c(printf("inptr = %p, inend = %p\n", inptr, inend));
while (inptr<=inend) {
if (!s->midline
&& (part = folder_boundary_check(s, inptr, lastone))) {
if ( (inptr-start) )
goto content;
goto normal_exit;
}
/* goto the next line */
while (inptr<=inend && (*inptr++)!='\n')
;
s->midline = FALSE;
}
/* *sigh* so much for the beautiful simplicity of the code so far - here we
have the snot to deal with the nasty end-cases that come from the read-ahead
buffers we use */
/* what this does, is if we are somewhere near the end of the buffer,
force it to the front, and re-read, ensuring we bunch as much together
as possible, for the final read, without copying too much of the time */
/* make sure we dont loop forever, but also make sure we try smaller
boundaries, if there are any, so we dont miss any. */
/* this is not needed for the header scanner, since it copies its own
data */
c(printf("start offset = %d atleast = %d\n", start-s->inbuf, s->atleast));
if (start > (s->inbuf + s->atleast)) {
/* force a re-scan of this data */
s->inptr = start;
if (already_packed)
goto smaller_boundary;
c(printf("near the end, try and bunch things up a bit first\n"));
already_packed = TRUE;
} else {
c(printf("dumping what i've got ...\n"));
/* what would be nice here, is if that we're at eof, we bunch the last
little bit in the same content, but i dont think this is easy */
goto content_mid;
}
}
c(printf("length read = %d\n", len));
smaller_boundary:
/* ok, we're at the end of the data, just make sure we're not missing out some small
truncated header markers */
if (overpart) {
overpart = overpart->parent;
while (overpart) {
if (overpart->boundary && (overpart->boundarylen+2) < s->atleast) {
s->atleast = overpart->boundarylen+2;
c(printf("Retrying next smaller part ...\n"));
goto retry;
}
overpart = overpart->parent;
}
}
if (s->inend > s->inptr) {
start = s->inptr;
inptr = s->inend;
goto content;
}
*length = 0;
s->atleast = atleast;
return NULL;
content_mid:
s->midline = TRUE;
content:
part = s->parts;
normal_exit:
s->atleast = atleast;
s->inptr = inptr;
*data = start;
*length = inptr-start;
/* printf("got %scontent: %.*s", s->midline?"partial ":"", inptr-start, start);*/
return part;
}
static void
folder_scan_close(struct _header_scan_state *s)
{
g_free(s->realbuf);
g_free(s->outbuf);
while (s->parts)
folder_pull_part(s);
if (s->fd != -1)
close(s->fd);
if (s->stream)
gtk_object_unref((GtkObject *)s->stream);
g_free(s);
}
static struct _header_scan_state *
folder_scan_init(void)
{
struct _header_scan_state *s;
s = g_malloc(sizeof(*s));
s->fd = -1;
s->stream = NULL;
s->outbuf = g_malloc(1024);
s->outptr = s->outbuf;
s->outend = s->outbuf+1024;
s->realbuf = g_malloc(SCAN_BUF + SCAN_HEAD*2);
s->inbuf = s->realbuf + SCAN_HEAD;
s->inptr = s->inbuf;
s->inend = s->inbuf;
s->atleast = 0;
s->seek = 0; /* current character position in file of the last read block */
s->unstep = 0;
s->header_start = -1;
s->start_of_from = -1;
s->start_of_headers = -1;
s->midline = FALSE;
s->scan_from = FALSE;
s->filters = NULL;
s->filterid = 1;
s->parts = NULL;
s->state = HSCAN_INITIAL;
return s;
}
static int
folder_scan_init_with_fd(struct _header_scan_state *s, int fd)
{
int len;
len = read(fd, s->inbuf, SCAN_BUF);
if (len>=0) {
s->inend = s->inbuf+len;
if (s->fd != -1)
close(s->fd);
s->fd = fd;
if (s->stream) {
gtk_object_unref((GtkObject *)s->stream);
s->stream = NULL;
}
return 0;
} else {
return -1;
}
}
static int
folder_scan_init_with_stream(struct _header_scan_state *s, CamelStream *stream)
{
int len;
len = camel_stream_read(stream, s->inbuf, SCAN_BUF);
if (len>=0) {
s->inend = s->inbuf+len;
if (s->stream)
gtk_object_unref((GtkObject *)s->stream);
s->stream = stream;
gtk_object_ref((GtkObject *)stream);
if (s->fd != -1) {
close(s->fd);
s->fd = -1;
}
return 0;
} else {
return -1;
}
}
#define USE_FROM
static void
folder_scan_step(struct _header_scan_state *s, char **databuffer, int *datalength)
{
struct _header_scan_stack *h, *hb;
const char *content;
const char *bound;
int type;
int state;
struct _header_content_type *ct = NULL;
struct _header_scan_filter *f;
size_t presize;
/* printf("\nSCAN PASS: state = %d '%s'\n", s->state, states[s->state]);*/
tail_recurse:
d({
printf("\nSCAN STACK:\n");
printf(" '%s' :\n", states[s->state]);
hb = s->parts;
while (hb) {
printf(" '%s' : %s\n", states[hb->savestate], hb->boundary);
hb = hb->parent;
}
printf("\n");
});
switch (s->state) {
case HSCAN_INITIAL:
#ifdef USE_FROM
if (s->scan_from) {
/* FIXME: it would be nice not to have to allocate this every pass */
h = g_malloc0(sizeof(*h));
h->boundary = g_strdup("From ");
h->boundarylen = strlen(h->boundary);
folder_push_part(s, h);
h = s->parts;
do {
hb = folder_scan_content(s, &state, databuffer, datalength);
} while (hb==h && *datalength>0);
if (*datalength==0 && hb==h) {
d(printf("found 'From '\n"));
s->start_of_from = folder_tell(s);
folder_scan_skip_line(s);
h->savestate = HSCAN_INITIAL;
s->state = HSCAN_FROM;
} else {
folder_pull_part(s);
s->state = HSCAN_EOF;
}
return;
} else {
s->start_of_from = -1;
}
#endif
case HSCAN_FROM:
s->start_of_headers = folder_tell(s);
h = folder_scan_header(s, &state);
#ifdef USE_FROM
if (s->scan_from)
h->savestate = HSCAN_FROM_END;
else
#endif
h->savestate = HSCAN_EOF;
/* FIXME: should this check for MIME-Version: 1.0 as well? */
type = HSCAN_HEADER;
if ( (content = header_raw_find(&h->headers, "Content-Type", NULL))
&& (ct = header_content_type_decode(content))) {
if (!strcasecmp(ct->type, "multipart")) {
bound = header_content_type_param(ct, "boundary");
if (bound) {
d(printf("multipart, boundary = %s\n", bound));
h->boundarylen = strlen(bound)+2;
h->boundary = g_malloc(h->boundarylen+3);
sprintf(h->boundary, "--%s--", bound);
type = HSCAN_MULTIPART;
} else {
header_content_type_unref(ct);
ct = header_content_type_decode("text/plain");
/* We can't quite do this, as it will mess up all the offsets ... */
/* header_raw_replace(&h->headers, "Content-Type", "text/plain", offset);*/
g_warning("Multipart with no boundary, treating as text/plain");
}
} else if (!strcasecmp(ct->type, "message")) {
if (!strcasecmp(ct->subtype, "rfc822")
/*|| !strcasecmp(ct->subtype, "partial")*/) {
type = HSCAN_MESSAGE;
}
}
}
h->content_type = ct;
folder_push_part(s, h);
s->state = type;
return;
case HSCAN_HEADER:
s->state = HSCAN_BODY;
case HSCAN_BODY:
h = s->parts;
*datalength = 0;
presize = SCAN_HEAD;
f = s->filters;
do {
hb = folder_scan_content(s, &state, databuffer, datalength);
if (*datalength>0) {
d(printf("Content raw: '%.*s'\n", *datalength, *databuffer));
while (f) {
camel_mime_filter_filter(f->filter, *databuffer, *datalength, presize,
databuffer, datalength, &presize);
f = f->next;
}
return;
}
} while (hb==h && *datalength>0);
/* check for any filter completion data */
while (f) {
camel_mime_filter_filter(f->filter, *databuffer, *datalength, presize,
databuffer, datalength, &presize);
f = f->next;
}
if (*datalength > 0)
return;
s->state = HSCAN_BODY_END;
break;
case HSCAN_MULTIPART:
h = s->parts;
do {
do {
hb = folder_scan_content(s, &state, databuffer, datalength);
if (*datalength>0) {
/* FIXME: needs a state to return this shit??? */
d(printf("Multipart Content: '%.*s'\n", *datalength, *databuffer));
}
} while (hb==h && *datalength>0);
if (*datalength==0 && hb==h) {
d(printf("got boundary: %s\n", hb->boundary));
folder_scan_skip_line(s);
if (!state) {
s->state = HSCAN_FROM;
folder_scan_step(s, databuffer, datalength);
s->parts->savestate = HSCAN_MULTIPART; /* set return state for the new head part */
return;
}
} else {
break;
}
} while (1);
s->state = HSCAN_MULTIPART_END;
break;
case HSCAN_MESSAGE:
s->state = HSCAN_FROM;
folder_scan_step(s, databuffer, datalength);
s->parts->savestate = HSCAN_MESSAGE_END;
break;
case HSCAN_FROM_END:
case HSCAN_BODY_END:
case HSCAN_MULTIPART_END:
case HSCAN_MESSAGE_END:
s->state = s->parts->savestate;
folder_pull_part(s);
if (s->state & HSCAN_END)
return;
goto tail_recurse;
case HSCAN_EOF:
return;
default:
g_warning("Invalid state in camel-mime-parser: %d", s->state);
break;
}
return;
}
/* drops the current state back one */
static void
folder_scan_drop_step(struct _header_scan_state *s)
{
switch (s->state) {
case HSCAN_INITIAL:
case HSCAN_EOF:
return;
case HSCAN_FROM:
s->state = HSCAN_INITIAL;
folder_pull_part(s);
return;
case HSCAN_MESSAGE:
case HSCAN_HEADER:
case HSCAN_MULTIPART:
case HSCAN_FROM_END:
case HSCAN_BODY_END:
case HSCAN_MULTIPART_END:
case HSCAN_MESSAGE_END:
s->state = s->parts->savestate;
folder_pull_part(s);
if (s->state & HSCAN_END) {
s->state &= ~HSCAN_END;
}
return;
}
}
#ifdef STANDALONE
int main(int argc, char **argv)
{
int fd;
struct _header_scan_state *s;
char *data;
int len;
int state;
char *name = "/tmp/evmail/Inbox";
struct _header_scan_stack *h;
int i;
int attach = 0;
if (argc==2)
name = argv[1];
printf("opening: %s", name);
for (i=1;i<argc;i++) {
const char *encoding = NULL, *charset = NULL;
char *attachname;
name = argv[i];
printf("opening: %s", name);
fd = open(name, O_RDONLY);
if (fd==-1) {
perror("Cannot open mailbox");
exit(1);
}
s = folder_scan_init(fd);
s->scan_from = FALSE;
#if 0
h = g_malloc0(sizeof(*h));
h->savestate = HSCAN_EOF;
folder_push_part(s, h);
#endif
while (s->state != HSCAN_EOF) {
folder_scan_step(s, &data, &len);
printf("\n -- PARSER STEP RETURN -- %d '%s'\n\n", s->state, states[s->state]);
switch (s->state) {
case HSCAN_HEADER:
if (s->parts->content_type
&& (charset = header_content_type_param(s->parts->content_type, "charset"))) {
if (strcasecmp(charset, "us-ascii")) {
folder_push_filter_charset(s, "UTF-8", charset);
} else {
charset = NULL;
}
} else {
charset = NULL;
}
encoding = header_raw_find(&s->parts->headers, "Content-transfer-encoding");
printf("encoding = '%s'\n", encoding);
if (encoding && !strncasecmp(encoding, " base64", 7)) {
printf("adding base64 filter\n");
attachname = g_strdup_printf("attach.%d.%d", i, attach++);
folder_push_filter_save(s, attachname);
g_free(attachname);
folder_push_filter_mime(s, 0);
}
if (encoding && !strncasecmp(encoding, " quoted-printable", 17)) {
printf("adding quoted-printable filter\n");
attachname = g_strdup_printf("attach.%d.%d", i, attach++);
folder_push_filter_save(s, attachname);
g_free(attachname);
folder_push_filter_mime(s, 1);
}
break;
case HSCAN_BODY:
break;
case HSCAN_BODY_END:
if (encoding && !strncasecmp(encoding, " base64", 7)) {
printf("removing filters\n");
folder_filter_pull(s);
folder_filter_pull(s);
}
if (encoding && !strncasecmp(encoding, " quoted-printable", 17)) {
printf("removing filters\n");
folder_filter_pull(s);
folder_filter_pull(s);
}
if (charset) {
folder_filter_pull(s);
charset = NULL;
}
encoding = NULL;
break;
default:
break;
}
}
folder_scan_close(s);
close(fd);
}
return 0;
}
#endif /* STANDALONE */
